Radar...
I use radar for nighttime navigation and it works the best. I can see all the boats around me, even the ones without lights, landmasses, marks, and rain squalls, even the ducks. Anything with reflective paint or markers on it really show up good, navigation marks with their reflectors really stand out, I can see them miles away. Not only can I see things, I can see how far away it is and in what direction it is moving. The Radar is integrated with all of the other navigation instruments on board, heading, course, speed, depth and other information is displayed on the screen. I wouldn't leave home without it.
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